Configurable load impedance for power amplifier predistortion calibration
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United States of America Patent
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Oct 21, 2014
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app pub date -
Apr 9, 2013
filing date -
Feb 14, 2008
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Abstract
An integrated circuit radio transceiver and method therefor includes an integrated circuit radio transceiver operable to provide specified gain levels and transmit path filter responses to correspond with a selected power spectral density mask. Changes in gain may be provided solely digital gain changes or may include analog gain module gain changes. A transmitter selects from one of at least three masks to reduce or eliminate spectral regrowth out of band to satisfy EVM requirements. Circuitry is provided to allow a transceiver to determine in advance what pre-distortion compensation settings are required for the various gain settings.
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